2554| 7
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φ10-φ6.8的同軸度是多少,?φ12-φ7.8的同軸度是多少?如下圖 |
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點(diǎn)評(píng)
嗯,。螺釘自已把自已擰緊,,還要把螺釘頭都沉進(jìn)去,不顯出坑來(lái),。,。。,。,。那干嘛要挖這個(gè)孔呢,,上螺絲有啥意義?
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